Auxiliary Electrode Layout for Common Electrode Voltage Drop
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Solution Overview
Problem
As display screens become larger, the common electrode in display devices experiences a voltage drop due to its increasing size and resistance, deteriorating display quality.
Innovation Solution
A display device design that includes an auxiliary electrode with an undercut shape, connected to the common electrode, reduces resistance by providing a stable contact and minimizing voltage drops, achieved through a simple fabrication method using specific layer structures and etching processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the common electrode size is increased to accommodate larger display screens, then the display area is improved, but voltage drop phenomenon occurs due to increased resistance
Solution Approach 1:
The common electrode is divided into multiple segments by introducing auxiliary electrodes that are electrically connected to each other and to the common electrode. This segmentation creates multiple parallel current paths, reducing the overall resistance and voltage drop across the large display area while maintaining the required display area.
2Reliability
If the common electrode resistance is reduced to minimize voltage drop, then voltage stability is improved, but device complexity increases
Solution Approach 1:
The auxiliary electrodes are formed in the same data conductive layer as the transistor electrodes, merging the formation process into a single step. The auxiliary electrodes share the same material composition and fabrication steps as the existing transistor electrodes, reducing device complexity while achieving reduced resistance and improved voltage stability.
3Reliability
If auxiliary electrodes are added to reduce resistance, then voltage stability is improved, but manufacturing complexity increases
Solution Approach 1:
The auxiliary electrodes are formed simultaneously with the transistor electrodes during the initial data conductive layer formation process. This preliminary action incorporates the resistance-reducing auxiliary electrodes into the fabrication workflow without requiring separate manufacturing steps, maintaining ease of manufacture while achieving improved voltage stability.
Data Source
AI summary
A display device includes: a substrate; a thin-film transistor disposed on the substrate and including a semiconductor layer; an interlayer insulating layer disposed on the thin-film transistor; a data conductive layer disposed on the interlayer insulating layer and including an auxiliary electrode and a transistor electrode connected to the semiconductor layer of the thin-film transistor, a via layer disposed on the data conductive layer; a pixel electrode layer disposed on the via layer and including: a pixel electrode and a dummy pixel electrode separated from the pixel electrode; an intermediate layer disposed on the pixel electrode layer; and a common electrode disposed on the intermediate layer. The auxiliary electrode includes a main conductive layer and an upper sub-conductive layer. Side surfaces of the main conductive layer of the auxiliary electrode are disposed inner than side surfaces of the upper sub-conductive layer of the auxiliary electrode.